So, if Rafa played the final rubber, the OOP would be:
Rubbers 1 & 2: Berdych v. Almagro/F. Lopez
and Stepanek/Rosol v. Ferrer
Rubber 3: Berdych/Stepanek v. M. Lopez/Nadal
Rubber 4: Berdych v. Ferrer
And guess what?
Rubber 5: Rosol (or Stepanek) v. Nadal
There's no way the CZE captain would choose Rosol I don't think. Based on Rosol's recent results it definitely seems like Wimbledon was a fluke performance - if it was a decisive fifth rubber would he go with the experienced player who has performed for the Czechs or the loose cannon who most likely would bomb? Yes Rosol has beaten Nadal so that would be a factor but more than Nadal himself, Rosol was on another planet that day. In the cold light of day that seems like quite a roll of the dice. Then again, they might think there's no way Stepanek could win vs Nadal - might as well try Rosol - could be a beatdown or everything could fall in place.
Would be quite nice for Nadal to win the fifth point vs Rosol.